Corkscrew



FIG. 1 is a right side view of the corkscrew;

FIG. 2 is a front view of the corkscrew, the back view being a mirror image of the front view;

FIG. 3 is a left side view of the corkscrew;

FIG. 4 is a top view of the corkscrew; and,

FIG. 5 is a bottom view of the corkscrew.

The broken lines in the drawings are included to show portions of the corkscrew that form no part of the claimed design. 

CLAIM The ornamental design for a corkscrew, as shown and described. 